Do good work, work that pays, that you're good at, that you can be proud of. Then go home. Switch off, and enjoy your hobbies. Learn an instrument, get good at cooking exotic foods, and find a workout routine you enjoy.
If you want to indulge your big ideas, read voraciously, and code up side-projects. Write a blog, or a book, or something like that. But don't try to make money from it. Betting your livelihood on your ideas puts too much pressure on, and you won't be happy. Most entrepreneurs aren't happy, not even the wealthy ones.